Admiral William H. McRaven’s Make Your Bed: Little Things That Can Change Your Life…And Maybe the World (Grand Central) — based on a 2014 graduation speech he gave at the University of Texas that went viral — was an immediate hit when it was published in early April, peaking at No. 5 on April 27.

As graduation season ended, sales slowed and by last week the book had dropped to No. 102. But now it’s soared up the list again, to No. 20 this week, thanks to a video of McRaven’s speech that’s caught fire on Facebook. (The full list will be published on Thursday.)

Produced by an inspirational company called Goalcast, the video (which had 91 million views as of Wednesday) incorporates footage of Navy SEALs training along with the retired admiral’s exhortations.

Goalcast’s video, posted on Aug. 16 with a link to the book, “immediately struck a nerve,” says Grand Central’s Caitlin Mulrooney-Lyski. “The video has had incredible reach in a short period of time and the admiral’s message is resonating, yet again, with a new audience.”

President Barack Obama talks with U.S. Navy Vice Admiral William H. McRaven, who as commander of Joint Special Operations Command (JSOC) had operational control of the mission to get Osama bin Laden, Friday, May 6, 2011, at Campbell Army Airfield in Fort Campbell, Ky.(Photo: Charles Dharapak, AP)

Why should make your bed? As McRaven said in his speech to grads: “If you want to change the world, start off by making your bed. If you make your bed every morning, you will have accomplished the first task of the day. It will give you a small sense of pride, and it will encourage you to do another task, and another, and another. By the end of the day, that one task completed will have turned into many tasks completed. Making your bed will also reinforce the fact that little things in life matter. If you can’t do the little things right, you’ll never be able to do the big things right. If, by chance, you have a miserable day, you will come home to a bed that’s made. That you made. And a made bed gives you encouragement that tomorrow will be better.”

The book, an expansion on the speech, revolves around 10 “fundamental life lessons” McRaven learned in SEAL training, such as “Stand Up to Bullies: Don’t Back Down from Sharks” and “Give People Hope: Start Singing When You’re Up to Your Neck in Muck.”

McRaven, now Chancellor of the University of Texas system, spent 37 years as a Navy SEAL, and as an admiral became Commander of all U.S. Special Operations Forces. He oversaw the military operation that led to the death of Osama bin Laden.

Writing a best-selling graduation speech isn’t always as easy as it looks. J.K. Rowling’s Very Good Lives, published in 2015 and based on a graduation speech she gave at Harvard, failed to make USA TODAY’s list.

Retired Admiral William H. McRaven has a best seller with his advice for grads.(Photo: Holly Reed)